飽和膨潤土之滲透係數及有效透水孔隙率與死孔孔隙率之關係研究

Relationship between Hydraulic Conductivity, Effective Porosity and Dead Pore Porosity of Saturated Bentonite

葉義章(Yi-Jang Yeh) ； 李和祥(Ho-Shiang Lee) ； 李明城(Min-Cheng Lee)

《致遠環境資源彙刊》 1卷1期 (2006/12) Pp. 11-20

https://doi.org/10.6597/DJER.2006.1(1).2

摘要

本文利用發展出之「達西示蹤實驗法」，研究發現，對不同蒙脫土而言，有可能膨脹性愈高或總孔隙率愈大，但其透水係數與有效透水孔隙率卻愈小，此乃因為其膨脹過程中，除了電雙層吸附水外，也形成了不連通的孔隙或所謂死孔孔隙的膠體團塊。本研究利用「達西示蹤實驗法」，以及黏土X光繞射分析，進一步發展出可以求得膨脹黏土中死孔孔隙的方法。初步運用該方法之研究結果顯示，美國MX-80蒙脫土吸收純水膨脹後的死孔孔隙率，遠大於台東樟原蒙脫土吸入純水膨脹後的情形，推測其吸水膨脹後的顆粒排列組合或膠結機制應該有所差異。

關鍵字

膨潤土 ； 滲透係數 ； 有效孔隙 ； 死孔孔隙

並列摘要

A new method called ＂Darcy tracer test＂ was successfully employed to determine both the hydraulic conductivity and effective porosity of different swelled clays with various total porosity or density. The nearest results showed that it is possible for clay to have high total porosity but very low effective porosity and low hydraulic conductivity. It is due to the occurrence of dead pore when clay is swelled. Besides, the latest results of this project successfully developed a process to determine the dead pore porosity, effective porosity and porosity of double-layer absorbed water of swelled clays.

並列關鍵字

bentonite ； hydraulic conductivity ； effective porosity ； dead pore porosity